Container Wall for a Container Covered by a Film

ABSTRACT

Container wall preferably made of concrete, in particular for containers for the storage and the fermentation of fermenting agents, which in the vicinity of the upper edge has an outwardly open clamping channel with an undercut for clampingly receiving an edge of at least one film made of plastics material covering the container on the upper face, the clamping channel having a narrow, outwardly open entry slot, the height thereof being smaller than the height of an elongate insertion profile insertable into the clamping channel, around which the film may be wound, the cross-sectional dimensions of the clamping channel, the entry slot and the insertion profile being such that the insertion profile in position relative to the entry slot is insertable via said entry slot into the clamping channel and is retained against being moved out of the clamping channel when the film wound around the insertion profile is under tension, characterised in that the narrow entry slot is only defined by an upper projection, whilst the approximately planar lower wall of the clamping channel merges without projections with the entry slot.

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a national stage application of PCT/EP2011/006375, Filed on Dec.16, 2011, which claims priority to DE 10 2010 055 527, filed on Dec. 22,2010, the entire content of which are hereby incorporated by reference.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH

Not applicable.

BACKGROUND OF THE INVENTION

The invention relates to a container wall according to claim 1.

Containers for the storage and the fermentation of fermenting agents,for example in so-called biogas plants, have sizeable dimensions.Generally they are configured in the manner of a silo and, accordingly,generally have a circular base. The wall is cast, for example, fromconcrete and the seal at the top is often implemented by means of aroof-shaped film which is retained in a tensioned and raised state bythe production of gas or by the introduction of compressed air. In orderto secure the film on the edge in an effective manner to the containerwall, it is also known to attach a clamping profile in the upper outerregion of the wall, into which the film edge is inserted and secured bymeans of a clamping tube.

It has been disclosed in DE 10 64 869 A to introduce the edge region ofa film sealing a container at the top into a peripheral slot which isopen at the top and U-shaped in cross section and then to introduce aninflatable tube in order to secure the film edge. It has been disclosedin DE 10 2006 035 227 B3 to secure both a gas storage cover and a covermade of film material in a C-shaped rail attached to the outside of thecontainer, a clamping tube being inserted into the rail to fix the filminside the rail.

Corresponding tensile forces are introduced via the films into the raildepending on the gas pressure prevailing in the container, thesupporting air pressure or external influences. Thus, as a result of thedeformation of the clamping profile or the lack of clamping force in theclamping tube, there is the risk that the film slips out of the rail.

In practice, this is also able to be counteracted by securely flangingthe film(s) to the container. The film is able to be subjected to loaduntil it tears. A disadvantage is the increased effort when opening thecover, for example for maintenance purposes. Moreover, the cover maylose its function when the film is torn, which has to be avoided.

A container wall for a container covered by a film has been disclosed inWO 2010/075981 A2, in which a clamping channel for a plastics film whichcovers the container on the upper face is provided with a narrow,outwardly open entry slot which is defined by an upper and a lowerprojection. An insertion profile is inserted into the entry slot, saidinsertion profile being able to be introduced into the clamping channelin the oblique position, and in a position approximately parallel to theprojections is prevented by the projections from moving out of theclamping channel. The clamping channel may be integrally formed in thematerial of the container wall or may be a separate profiled rail, whichis either positioned on the container wall or integrally formed therein.Two undercuts are formed by the projections, which are relatively costlyto produce irrespective of whether a separate clamping profile is usedor the clamping channel is moulded into the material of the containerwall. Additionally, by means of the two projections, the introduction ofthe insertion profile into the clamping channel is made more difficultand/or only permitted by specific shaping of the clamping channel.

It is also known to form the lower limb of a clamping profile separatelyand to attach it pivotably or displaceably to the remaining profile.Thus the possibility is provided of enlarging the entry slot for theclamping channel in order to simplify assembly.

BRIEF SUMMARY OF THE INVENTION

The object of the invention is to provide a container wall for acontainer having a device for securing a film made of plastic sealingthe container on the upper face in a roof-shaped manner, which can beproduced and assembled even more simply.

This object is achieved by the features of claim 1.

In the container wall according to the invention, the narrow entry slotis only defined by an upper projection, whilst the approximately planarlower wall of the clamping channel merges without projections with theentry slot.

In the invention, it has been recognised that for securing the insertionprofile in the clamping channel, it is sufficient if, when tension isapplied to the film, the insertion profile bears from the inside againstthe upper projection and the insertion profile is supported on the lowerwall of the clamping channel. There is no risk of the insertion profileslipping out at the lower edge. It may be necessary during assembly,after inserting the insertion profile with the film positioned aroundsaid insertion profile, simply to ensure that the lower edge of theinsertion profile does not slip out beyond the entry slot, as long as notension has been applied to the film. However, simple means areavailable for this.

The production of a clamping channel with only one upper projection issignificantly simpler in terms of production technology than that of aclamping channel in which the entry slot is formed by an upper and alower projection. Moreover, the insertion of the insertion profile withthe film placed around said insertion profile into the clamping channelaccording to the invention is decidedly simpler to implement than withthe known clamping profile. Moreover, the shape of the clamping channelmay be considerably simplified. The lower wall of the clamping channeldoes not need to be continuous but may consist of wall portions spacedapart in the longitudinal direction of the clamping channel.

The container wall according to the invention is preferably producedfrom concrete and in the upper region the upwardly open clamping channelis provided with the preferably lateral entry slot, the height thereofbeing smaller than the height of an elongate insertion profile which isinsertable into the clamping channel, around which the film is able tobe placed. The insertion profile with the film wound around saidinsertion profile is tilted relative to the entry slot, introduced viasaid slot in the clamping channel and then, for example, moved into avertical position, so that when a tensile force is exerted on the film,it is pressed from inside against the upper projection which defines theentry slot. The lower edge of the insertion profile is located on theapproximately planar lower wall of the clamping channel. By means ofsuch a construction, high tensile forces may be absorbed without therisk of the film sliding out of the clamping channel.

In order to protect the film from tearing in the event of forces whichare too great, according to an embodiment of the invention the insertionprofile may have a predetermined breaking point, said insertion profilebending substantially about a horizontal axis when a predeterminedmaximum force acts on the film. According to a further embodiment of theinvention, the insertion profile may be produced from a material which,when a maximum permitted force is reached on the film, loosens orreleases the non-positive connection of the film by its own deformation.The insertion profile is preferably produced from continuous casting orplanar material which, for example, consists of metal, rubber orplastics. It may be moulded as a flat strip or bent or folded, or be amore or less flat profile strip. The flat strip may have a rectangular,trapezoidal or angled cross section.

Depending on the pressure conditions in the container and the wind forceacting on the roof film, considerable tensile forces are exerted on thefilm edge. Thus, there is the risk that the film edge is pulled out whenthe tensile forces exceed a specific value. This risk is increased whenthe angle of the film edge relative to the associated limb of arail-shaped clamping profile adopts a greater value, so that the limb issubjected to deformation and is bent upwards and the non-positiveconnection between the film edge and the clamping profile is reduced.

In an embodiment of the invention, it is ensured that, in particularwhen a greater tensile load is applied to the film, the tensile forceacting on the upper limb which faces said film is introduced into thelimb substantially as compressive force, and only acts on the limb as asmaller bending moment. Therefore, this does not lead to disadvantageousdeformation of the clamping profile, resulting in the film edge beingpulled out.

The film edge extends, for example, at an angle of 30° to 45° relativeto the horizontal. The limb of the clamping profile facing the film edgepreferably extends at the same angle. As a result, in comparison with ahorizontal limb, more force may be introduced by the film into the rail,before the rail loosens the non-positive connection by deformation.Thus, even with greater tensile force values, a secure anchoring of thefilm edge in the clamping profile is ensured by means of the invention.

Such a profiled rail may be fastened to the outside of the containerwall. To achieve this, there are different structural possibilities. Oneoption according to an embodiment of the invention is that verticalfastening profiles may be attached at intervals to the outside of thecontainer wall, to which the profiled rail is preferably fastened bywelding. The rail, which preferably consists of longitudinal portionswhich are subsequently connected together, is initially bent and thenconnected non-positively to the fastening profiles. Said fasteningprofiles are then connected to the container wall, for example by meansof suitable anchors. The container wall in this case may consist of verydifferent materials, for example concrete, steel, plastics or woodand/or consist of a combination of the different materials.

In a further embodiment of the invention, in this connection it isprovided that the fastening profile is U-shaped in cross section, theweb of the fastening profile being able to be connected to the containerwall.

A clamping profile in the form of a profiled rail may be cast into thecontainer wall. Even with this solution, a high tensile force may beachieved when the clamping profile is arranged at a specific distancefrom the upper edge of the container wall. There is no risk ofdeformation of the limb of the rail facing the film edge.

In a further embodiment of the invention, the upper edge or the upperlimb of the profiled rail is flush with the upper face of the containerwall. According to a further embodiment of the invention, the upper faceof the container wall may rise towards the outer face.

If the clamping profile and/or the profiled rail is cast into thecontainer wall at a distance from the upper face of the container wall,according to a further embodiment of the invention the outer upper edgeof the wall is rounded. In this manner, the film is not subjected to asmuch stress.

When integrally forming the profiled rail in the material of thecontainer wall, the thickness of the material of the profiled rail,which is preferably formed from flat material or continuous casting,only needs to be very small as the forces are substantially absorbed bythe surrounding material of the container wall.

As a result of the measure according to the invention, after clampingthe film the insertion profile is securely supported against the lowerwall. The risk of the insertion profile being moved out beyond the entryslot does not exist. This risk is potentially present, however, duringassembly shortly after inserting the insertion profile and beforetensioning the roof film. There is also the risk that for other reasonsthe tension on the roof film is reduced or is released. Thus, anembodiment of the invention provides that the lower wall in the vicinityof the entry slot of the clamping channel has raised portions inlongitudinal sections, which are arranged to be removable or movable, sothat in a first position they form an abutment for the insertion profilelocated in the clamping channel and in a second position open up thesurface of the lower wall facing the clamping channel. Before mountingthe insertion profile with the film placed around said insertionprofile, the surface of the lower wall facing the clamping channel iscompletely open, so that the insertion profile together with the filmmay be inserted without difficulty. According to the disclosedembodiment of the invention, a series of abutment elements and/or raisedportions is subsequently mounted, which prevent the lower edge of thebearing profile from slipping out of the entry slot.

Various structural options are conceivable in order to implement thedisclosed embodiment. According to an embodiment of the invention,abutment elements which may be inserted or screwed into openings of thelower wall are provided. Said abutment elements may, for example,consist of plastic.

According to a further embodiment of the invention, folding mechanismsmounted on the lower wall are provided. The folding mechanisms areconfigured such that they permit in a folded-down position a freeinsertion of the insertion profile and in the folded-up position form anabutment and/or an obstruction for moving the insertion profile out ofthe entry slot. Finally, clamping elements which are also able to beclamped from the front onto the lower wall may be provided in order toform an abutment. However, it should be stressed again that thedescribed abutment and raised portions are not required for the functionof securing the film in the clamping profile. They are simply aids formounting and if there is a risk of the clamping profile slipping out dueto insufficient tension in the film.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

Exemplary embodiments of the invention are described in more detailhereinafter with reference to the drawings, in which:

FIG. 1 a shows schematically the plan view of a container.

FIG. 1 b shows a section through the view according to FIG. 1 along theline 2-2.

FIG. 2 shows a detail III according to FIG. 1 b for securing a rooffilm.

FIG. 3 shows a further embodiment of the securing of a roof film.

FIG. 4 shows a further embodiment for securing a roof film.

FIG. 5 shows a further embodiment for securing a roof film.

FIG. 6 shows a further embodiment for securing a roof film.

FIG. 7 shows a further embodiment for securing a roof film.

FIG. 8 shows a further embodiment of the invention for securing a rooffilm.

FIGS. 9 a & 9 b show a similar embodiment to FIG. 8.

FIG. 10 shows in a perspective view a clamping profile with differentabutment elements.

FIG. 11 shows a section through a clamping profile according to theinvention having a clamping mechanism.

FIG. 12 shows the front view of the clamping profile according to FIG.11.

FIG. 13 shows a further embodiment of a clamping profile according tothe invention.

DETAILED DESCRIPTION OF THE INVENTION

While this invention may be embodied in many different forms, there aredescribed in detail herein a specific preferred embodiment of theinvention. This description is an exemplification of the principles ofthe invention and is not intended to limit the invention to theparticular embodiment illustrated.

A container 10 is indicated in FIGS. 1 a and b, said containercomprising a base 12 made of concrete and a cylindrical wall 14, alsomade of concrete. The concrete wall is produced, for example, by meansof a plurality of shuttering elements arranged externally andinternally. At least one plastic film 16 is stretched over the top ofthe container 10, the edge thereof being secured in the upper region tothe outer face of the wall 14, as will be described in more detailbelow. For example a fermenting agent 18 is located in the container. Aperipheral walkway 20 with a handrail is shown on the outer face of thewall 14. The walkway consists of individual walkway elements which mayalso be connected together. The walkway is not of significance to theinvention. In Fig. lb, an external shuttering 26 and an internalshuttering 27 are also indicated. It serves, as mentioned above, forproducing the wall, the shuttering being removed after constructing theconcrete wall 14.

In FIG. 2, the upper part of the container wall is shown at 110, as mayalso be identified in FIG. 3. It contains a clamping channel 112 whichhas a base 114, an upper wall 116 and a lower wall 118. At thetransitions, the walls are curved in cross section. By means of aprojection 120 facing downwards (in cross section) a narrow entry slot124 is formed towards the channel 112. The lower wall mergescontinuously with the entry slot 124. A clamping element in the form ofa planar profile 126 has approximately the same dimensions over itsheight and/or depth and is rounded at the edges. The width of the planarprofile 126 is greater than the height of the entry slot 124 and isdimensioned so that it is retained by the inner face of the projection120 and the wall 118 when the planar profile 126 is positioned on thelower wall 118. In the tilted position of the planar profile 126 shownin dotted lines and which is shown at 126′, said planar profile may beinserted into the groove 112 via the entry slot 124. Additionally, afilm 130 is wound around the planar profile 126. After inserting theplanar profile 126 and positioning the planar profile 126 on the wall118, by pulling on the film 130 the planar profile 126 is tilted backinto an approximately vertical position parallel to the entry slot. As aresult, the film 130 is clamped in the channel 112 and cannot be pulledout.

As may also be identified, the planar profile 116 has a notched portion132 which forms a predetermined breaking point. In the case of anaccident, the predetermined breaking point as a last resort prevents thefilm from being torn and is able to ensure emergency pressure relief.

It goes without saying that the clamping channel 112 is also able to beproduced, for example, by a separate profiled rail which is describedfurther below. In this case, the profile of the clamping channel and theclamping element in the clamping channel are essential for securing thefilm.

In FIGS. 3-5, a section is shown through the upper region of thecontainer wall 14 which, however, is configured differently in the upperregion, as is described below. Moreover, external shuttering andinternal shuttering 26, 27 is also identified according to FIG. 1 bduring the production of the container wall from concrete. The insertionprofile or planar profile is omitted for illustrative purposes.

In FIG. 3, a box-shaped profiled rail 36 is shown, which for example hasthe shape as shown in FIG. 2. As is visible, the profiled rail 36 isincorporated into the wall 14 so that the upper face and/or the upperlimb is flush with the horizontal upper face of the wall 14. Duringproduction, the profiled rail 36 is releasably connected to the externalshuttering 26 (not shown). After forming the wall 14, naturally theshuttering 26, 27 is removed, the releasable connection to the externalshuttering 26 being previously removed. The profiled rail 36 is thenconnected to the wall 14.

The profiled rail consists of individual portions of specific lengthwhich is preferably considerably shorter than the peripheral length ofthe container 10. In this case, a rail portion may be connected to oneor more adjacent shuttering elements. The profiled rail 36 and/or theindividual portions thereof are provided with anchoring portions which,as shown at 38, protrude obliquely downwards into the wall 14. In FIG.3, by means of the arrows 40, the pulling direction of a film isindicated which is denoted in FIG. 1 b at 16. It is secured in theprofiled rail 36. This is described further below. The variable anglesof the pulling direction 40 result from the type of film (gas storagefilm, air-supported dome) and the structural conditions. The pressureand bending force on the upper limb of the profiled rail alter dependingon the size of the angle.

The embodiment according to FIG. 4 differs from that of FIG. 3 in thatthe profiled rail 36 is embedded at a distance from the upper face ofthe wall 14. In this case, the profiled rail 36 is also initiallyconnected to the external shuttering 26. The film which is secured withits edge in the profiled rail 36, initially extends vertically on theoutside of the wall 14 and is guided obliquely upwards via a roundededge 42 of the wall 14. The rounding 42 reduces the stress which occursby deflecting the film.

In FIG. 5, a profiled rail 18 a is also embedded into the wall 14 sothat its upper edge is flush with the upper face of the wall 14. Thisupper face has, however, an incline as indicated at 44. The incline isoriented towards the outer face. The rail 18 a is in turn releasablyconnected to the external shuttering 26 when the wall 14 is produced.Subsequently, this connection is released so that the externalshuttering 26 may be removed. A tilted attachment of the profiled railhas the advantage that markedly greater tensile resistances for the filmedge and/or advantageous loading of the profiled rail may be achieved.The upper limb is substantially loaded in its direction of extension andless on flexion. The film edge is thus held particularly securely in theprofiled rail 18 a.

A profiled rail 200 is attached to the container wall 14 in FIG. 8, saidprofiled rail having a lower horizontal wall portion 202, an upperroof-shaped wall portion 204 and a vertical web portion 206. The obliqueupper wall portion 204 merges with a projection 208 protrudingvertically downwards. A planar profile 212 is inserted into the clampingchannel 210 formed in this manner, the width of said planar profilebeing greater than the height of the entry slot 214 in the clampingchannel 210. The entry slot is formed by the approximately planar lowerwall 202 which merges without projections with the entry slot 214 andthe projection 208. The film 130 (see also FIG. 2) is wound around theupper projection 208 and around the planar profile 212 so that, in thelower region of the entry slot 214, it leaves said entry slot in thedownward direction. When pulling on the film 130, the planar profile 212is pressed in the upper region against the projection 208 and at thesame time pressed downwards against the lower wall 202, so that in thismanner the film 130 is clamped effectively in the profiled rail 200. Theincline of the upper wall 214 corresponds to the angular extent of thefilm 130. This is, however, not a prerequisite. In principle, the upperwall 204 could also extend horizontally.

On the lower face of the lower wall 202 retaining portions 216 made ofsheet steel or the like are attached at intervals, said retainingportions comprising holes through which an anchoring screw 218 may bepassed in order to screw said anchoring screw in the concrete wall 14.The profiled rail 200 and/or the longitudinal portions thereof may beformed by edging planar material. However, production by an extrusionmoulding method is also conceivable.

Instead of embedding a clamping profile in the form of a profiled railin the wall, a positive profile made of plastic may be connected to theshuttering which is subsequently removed from the wall, for example byheating or by means of a reagent. Subsequently, a clamping profileremains in the wall with the same function as the clamping rail.

In FIGS. 6 and 7, other options for forming a clamping profile areindicated. In FIG. 6, an external shuttering element 40 a is releasablyconnected to a fibre concrete part 42 a, the releasable connection whichhas to be accessible from outside, not being shown. The fibre concretepart 42 a has a prefabricated channel 44 a, and when casting theconcrete is embedded therein (wall 14 a). The fibre concrete part 42 amay be prefabricated. It may be already connected to the shutteringelement 40 a remotely from the building site, before it arrives on site,or connected on site to the shuttering element 40 a.

Merely for the sake of completeness it should be mentioned that only oneshuttering element and/or one profiled shuttering element is discussed.It goes without saying that, viewed in the peripheral direction, aplurality of external shuttering elements 40 a are provided and also aplurality of profiled shuttering parts 42 a.

In FIG. 7, a further option is shown. In this case, a concrete element46 a is positioned on the upper face of the concrete wall 14 b, saidconcrete element being provided with a clamping channel 44 a. Theconcrete element 46 a is prefabricated and has a reinforcement 48 aprotruding downwards which may be inserted into the soft concrete aftercasting the wall 14 b, in order to connect the concrete element 46 a tothe wall 14 b. In this case, the shuttering elements 40 a, 40 b areslightly lower than the height of the container wall 14 b, namelyreduced by the height of the finished concrete element 46 a.

In FIG. 9 a, it is shown how the insertion profile 212 is inserted frombelow in the vertical position into the entry slot 214. In the clampingchannel, the insertion profile 212 is positioned obliquely with itslower edge in the vicinity of the wall 206 and with the upper edgebearing against the projection 208 from the inside. A projectionrelative to the wall 202 is not provided. Similarly, the film 130positioned around the insertion profile is sufficiently clamped and notable to slip out.

Depending on the width of the planar profile 212 and the width of thelower wall 202, said planar profile has to be inserted in the obliqueposition into the slot 214, as for example required by FIG. 8, primarilywhen the lower wall 202 extends as far as the height of the projection208. In FIGS. 9 a and 9 b, the wall 202 is shorter than the distance ofthe projection 208 from the wall 14, which permits the verticalinsertion of the insertion profile 212 into the slot 214. Subsequently,it is positioned obliquely according to FIG. 9 b.

FIG. 10 shows in perspective a part of a clamping profile 300 with anentry slot 314. The clamping channel 312 is formed by a lower planarwall 316, a rear wall 318, an upper wall 320 and a portion 322 edged tothe front away from the upper wall, which as a projection defines theentry slot 314 from the top.

Abutment elements 326 and/or 328 may be inserted into openings of thelower wall 316. They are located in the vicinity of the entry slot andmay optionally be removed. The cylindrical abutment element 328 may, forexample, be also screwed into a hole of the lower wall 316. The abutmentelement 326 is planar and has a cuboidal projection which is insertedinto a suitable hole. The abutment elements are, for example, made ofplastic.

Moreover, in FIG. 10 a spring clip 330 of U-shaped cross section isshown which may be clamped from the front edge of the lower wall 316onto said edge. The clip 330 has on the upper limb an outwardly angledportion 332 which also forms an abutment for an insertion profile (notshown) which may be inserted via the entry slot 314 into the clampingchannel 312. For this insertion, however, the abutment elements shownmay be temporarily removed. Subsequently, they may be mounted again. Theabutment elements are simply examples. They are arranged at intervals,wherein naturally only one type of the elements shown is used.

In FIGS. 11 and 12, a part of a clamping profile 400 is shown with anupper roof-like oblique wall 402, a rear wall 404 as well as a lowerwall 406. An entry slot 410 is formed between an angled portion 408 ofthe upper wall 402 which forms a projection and the lower wall 406. Theinsertion profile is not shown here.

A sheet metal part 412 is welded to the lower wall 406 from below. Withone rear edge 414 the sheet metal part is aligned with the rear wall404. To the front, the sheet metal part 412 has an arcuate edge 416. Onthe upper edge the sheet metal part 412 has a notch 418 and/or a recess.Through the sheet metal part 412 extends a pin 420, the ends thereof onboth sides protruding over the sheet metal part 412. The pin extendsthrough retainers 422 on each side of the sheet metal part 412, thecontour thereof being visible in FIG. 11. The retainers 422 have anelongated hole 424 through which the pin 420 respectively extends. Arectangular abutment portion 426 is welded to the retainers 422, saidabutment portion in the position shown in FIG. 11 protruding into thenotch 418. If the abutment portion 426 is raised together with theretainers, the abutment portion 426 is lifted out of the notch andtogether with the retainers 422 may be pivoted clockwise, as shown indashed lines. In this position, the surface of the lower wall 406 facingthe entry slot 410 is open and permits the simple insertion of theinsertion profile. Subsequently, the folding mechanism shown may againbe pivoted back into the position shown in FIG. 11, in order to preventthe insertion profile with the film from slipping out.

In FIG. 13 a clamping profile 500 is shown which is substantiallysimilar to that of FIG. 10. However, the lower wall is subdivided intoindividual wall portions 402 which are separated from one another atintervals. In this manner, material may be saved when producing theclamping profile 500, for example when edging the sheet metal material.

This completes the description of the preferred and alternateembodiments of the invention. Those skilled in the art may recognizeother equivalents to the specific embodiment described herein whichequivalents are intended to be encompassed by the claims attachedhereto.

1. A container wall preferably made of concrete, in particular forcontainers for the storage and the fermentation of fermenting agents,which has, in the vicinity of the upper edge, an outwardly open clampingchannel with an undercut for clampingly receiving an edge of at leastone film made of plastic covering the container on the upper face, theclamping channel (112) having a narrow, outwardly open entry slot (124),the height thereof being smaller than the height of an elongateinsertion profile (126) insertable into the clamping channel, aroundwhich the film (130) may be wound, the cross-sectional dimensions of theclamping channel (112), the entry slot (124) and the insertion profile(126) being such that the insertion profile (126) in a first position isinsertable into the clamping channel (112) and in a second position isretained against being moved out of the clamping channel when the film(130) wound around the insertion profile is under tension, wherein thenarrow entry slot is only defined by an upper projection, whilst theapproximately planar lower wall of the clamping channel merges withoutprojections with the entry slot.
 2. Container wall according to claim 1,wherein the insertion profile (126) has a predetermined breaking point(132), the insertion profile (126) bending substantially about ahorizontal axis when a predetermined force acts on the film (130). 3.Container wall according to claim 1, wherein the insertion profile isproduced from a material that when a maximum permitted force is exertedon the film, loosens or releases the non-positive connection of the filmby its own deformation.
 4. Container wall according to claim 1, whereinan annular clamping profile is arranged in the upper region of thecontainer wall, said clamping profile having the inner clamping channelwith an outwardly open entry slot, wherein in addition the region of thefilm in the vicinity of the wall encloses an angle relative to thehorizontal and the clamping profile has an upper limb and a lower limbwhich is inclined relative to the upper limb of the clamping profilefacing the film so that it extends approximately parallel or at a smallangle to the film until the maximum permitted tensile load is applied tothe film, such that a force applied by the film on the upper limb actsto its greatest extent as compressive force on said limb.
 5. Containerwall according to claim 1, wherein the clamping channel and/or theclamping profile are moulded in the material of the concrete wall. 6.Container wall according to claim 5, wherein a profiled rail (36, 56,222) is at least partially cast into the concrete wall.
 7. Containerwall according to claim 1, wherein the profiled rail (18 a, 222) can befastened from outside to the container wall.
 8. Container wall accordingto claim 5, wherein the upper edge or the upper limb of the profiledrail is flush with the upper face of the container wall (14). 9.Container wall according to claim 5, wherein the upper face (44) of thecontainer wall rises towards the outer face.
 10. Container wallaccording to claim 5, wherein the profiled rail (36) is arranged at adistance below the upper face of the container wall (14) and the outeredge of the wall upper face is rounded.
 11. Container wall according toclaim 1, wherein the clamping profile is made up of two or more railportions.
 12. The device according to claim 1, wherein the clampingprofile (56) consists of rail portions divided in the longitudinalplane, which are non-positively connected together in the web region.13. Container wall according to claim 1, wherein the clamping channeland/or the clamping profile (36, 18 a, 222) are formed by a permanentshuttering.
 14. Container wall according to claim 13, wherein thepermanent shuttering is rail-shaped (36, 18 a, 222) and/or consists ofrail portions.
 15. Container wall according to claim 1, wherein thelower wall in the vicinity of the entry slot of the clamping channel hasraised positions in longitudinal sections which are arranged to beremovable or movable, so that in a first position they form an abutmentfor the insertion profile located in the clamping channel and in asecond position the abutment is removed from the entry slot. 16.Container wall according to claim 15, wherein abutment elements (326,328) which may be inserted or screwed into openings of the lower wall(316) are provided.
 17. Container wall according to claim 15, whereinfolding mechanisms (408) mounted on the lower wall (404) are provided.18. Container wall according to claim 15, wherein clamping elements(330) are provided which are configured to be able to be removablyclamped at the front onto the lower wall (316).
 19. Container wallaccording to claim 1, wherein the lower wall consists of wall portions(502) spaced apart in the longitudinal direction of the clamping profile(500).